global map attributes

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I started writing down some ideas to extend the referential attribute idea,
and it turned into a long document (complete with CDL examples! :).
Essentially, I'm wondering if it wouldn't be better to actually name
alternate coordinate systems for a variable in a referential attribute.  A
named coordinate system appears as a global attribute, which then lists the
component variables in the coordinate system.  I think it works well for
the examples I tried.  See this URL if interested:

	http://www.atd.ucar.edu/rdp/gjg/coords.html

Gary

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